I have now had 'Misty' (Telsa Model S 75D) for three months and have been delighted with her although there are many niggles.
First, the performance (0-60MPH in 4S) and handling are awesome. It is a beautiful car to drive. The way the whole technology comes together is impressive with the Sat Nav able to pick up addresses from events in my calendar (via my iPhone), the (so far limited) auto pilot, the audio system (DAB/FM/AM plus Internet Radio, Spotify and USB FLAC) and remote management from an iPhone App.
In terms of range, although 300 miles is stated it is looking like only 150 miles (for short trips) on full charge at this time of the year. The power usage is much higher when the battery is cold. The range is much better when the battery is warm and this means more range in warmer times, on longer journeys (which warm up the battery) and starting after a charge (which warms up the battery). The best I've had equates to around 250 - 300 miles on a full charge. I usually charge at home on a dedicated circuit which charges at 30A giving me about 20 miles charge an hour. I also use the free Tesla Superchargers which can charge at 120KW. A couple of times I've used other charging networks. Power consumption is measured by watt hours per mile and mine varies between 250 and 450 depending upon driving conditions, degree of acceleration (irresistible but it does use more electricity), outside temperature, road conditions (more power in the wet because of lower grip) and wind resistance (you can see instant and short term energy consumption).
Although I love it and would buy another it is IMHO a disruptive technology still at the early adopter phase (I would expect widespread adoption beginning sometime in the next decade). Tesla are still learning how to be a car company and still need to iron out manufacturing processes, service and quality. I have had almost no problems with the car or the service but others have. The approach to charging (home, destination and journey) needs to be resolved. For example, there are at least 4 or 5 charging networks in the UK and, although they use the same connectors, multiple accounts are required. Driver assistance is coming along well but full self driving is many years away. The technology is driving a huge amount of change and improvements both in car software (over the air updates) and hardware.
The cost is high. I bought Misty on a 4 year PCP at 1.5% interest rate. my reckoning is that in 4 years time it will have depreciated significantly as new technology becomes better and cheaper. I ordered when Tesla had introduced some major upgrades and reduced prices - this will happen again and again. The deposit was about the same as the cost of a 272/250 .